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It's a nice bike but I think none of the parts are c-record. Rear mech looks like nuovo record, hubs & brakes are nuovo/super record era. Shifters & front mech are c-record era but not neccessarily c-record (could be athena for example).
Regarding the crankset, it may be an ofmega sr copy judging by the dust caps? While everyone made copies of the SR crankset, quite a lot of these copies are actually superior to the original, especially as regards the finish. The edges at the intersection between the crank arm and the spider are rather sharp on the original campa cranks that's why they are very prone to hairline fractures in this area. Imho it's a flawed design: https://www.lfgss.com/comments/13219300/ . The sugino mighty, which is also a campa SR copy more or less, has a finish which is miles better with rounded edges at the crank arm-spider intersection which has the effect that stress is distributed more evenly. I wouldn't be surprised if your bike originally came with campa cranks which were replaced after they failed... but that's just a guess.
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Sig_Arlecchino
keepit
Thanks both. Don't have the bike yet, just working from limited ebay pictures so don't know PCD. I think (hope) that the rest of the group is C-Record but it's hard to tell. Might be Chorus according to Velobase, I'm totally uneducated in these things but bought on impulse. Probably paid too much, oh well. Guess I could always change my name to Adam Brown or something.
http://www.ebay.co.uk/itm/VINTAGE-MERCIAN-531-ROAD-BIKE-EROCIA-CAMPAGNOLO-/292057927631?